[Performance] Data store Virtual disk LUN or a raw device

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• HP EVA virtual disk LUN ID

  I posted this is 3.0, but I wanted to try here also.

  We are in the process of upgrading of 4 guests isolated from 3.02 to 3.5. All network configuration is identical on all hosts, but the client has decided to present a separate HP EVA virtual virtual disk (LUN) for each host. Isolation was a contractual obligation. The question I have is on shared disk and LUN ID.

  I want to use VMotion to minimize downtime. Since they do not share currently disc, I need first to present all the LUNS (HP EVA virtual disks) on all servers.

  My question concerns the LUNS ESX ID. EVAs HP do not allow you to set the LUN ID the first (HP EVA virtual disk (LUN) presented to a host receives a LUN ID of next 1, 2, 3, etc..) In my case, the ID of the LUN on current drive of each host is set to 1. When I introduce all disks to all hosts now have a situation where A ESXHOST will see the LUN ID 1 for a 'DISK 1' and 2 ID LUN "disc 2", while ESXHOST-B could show exactly the opposite.

  It will be temporary because as soon as I can VMotion servers out, I will redo the presentation so all match however; There will be a short period where ID LUN will differ from a drive on different hosts.

  Is that going to be a problem?

  Hello

  You can set the LUN ID on the EVA only when he introduced a LUN to just one host at a time. It's a bit annoying, especially when you have a lot of guests. But the fact in this way you can ensure that all LUNS are presented with the same ID for the guests.

  If you select multiple hosts at the same time the CommandView chooses the next available on its own LUN number.

  Thorsten

• Create a drive to another data store virtual computer

  ESX 3.5 Cluster 2 nodes - all VM are Windows Server 2003

  I can't remember the number of update.

  Subsystem of disk for data warehouses are 4 Gb Fibre

  2 data warehouses:

  datastore1 = SAS drives

  datastore2 = MDL (SATA)

  Name of the virtual machine to add the new drive: GOOFY

  I have this a GOOFY VM in need of a new 100 GB drive attached to it. The VM GOOFY lies in datastore1. The new drive should be created in the datastore2 beacuase it's static data. No change in the files, basically just to read the data of documents high IO performance is not necessary.

  How do I do that?

  Temporarily, I have created a virtual machine called GOOFY_D with this size of attached to the new 100GB.vmdk and assigned to the new drive as the "D:" drive and DINGO and removed from the virtual machine to inventory. It works but I want to do it properly.

  Yes, it was the way of "Mickey Mouse" to do, but hey, it works!... for now.

  Thank you

  I don't have access to a test environment for the moment. However. If you are only asked for the data store, it should automatically create a folder with the name of the virtual machine on this datatstore.

  André

• Performance of the virtual disks

  Hello!

  Two questions

  1 - it there really a big difference in the performance of the discs thin vs thin discs? one of my friends said slim is slower because he may need more and this growing each time may reduce the speed and performance. is this really?

  2. I get no difference between the discs of updated zero lazy-reset and greedy. that means for the impatient..., are the blocks are written by 0 at the beginning?

  There are a few blocks in the disc ok? then, what is the point to write zero in each of them and then change the exact data we want to be on that block? (maybe there is 1 maybe 0)

  Thank you very much

  So I will use zero - eager to drive thick for my server files (300 users and millions of files) and lazy zero for databases and thin for operating systems and machines at low load of I/O and small changes

  I recommend thick eager-reset to zero especially for databases. It can depend on the workload, however, there are various tutorials for how to configure databases. MS - SQL I usually create virtual discs eager-reset to zero and follow the best spirit of practice of MS formatting NTFS with a 64 KB Cluster size. Where the OS is Windows 2003, don't forget to align the partition! For more information, see Disk Partition alignment Best Practices for SQL Server

  Since, as you have discovered - reset is required will certainly benefit you eager-reset of the virtual disks.

  When you use thin disks, make sure you have the alarms in place to avoid the problems of out-of-space drive!

  André

• Nobody knows the largest available space supported for vmfs data store when creating a new form of vmfs data store a 3T lun mapped from FC storage.

  I traced a form of lun 3 t FC storage.

  And the project to create a vmfs on this lun, creating, data store, space available by default is 1024 G, no 3 t, so I guess that maybe some limitations.

  Anyone know? Thank you very much.

  Hello

  The limit is 2 TB - 512Bytes

  That 512 bytes is VERY important to remember.

  You will see that 1 TB as it roles once you exceed 2 tablespoons.

  As Anton suggested you can use two 1.5 TB LUN safely. However, you can in fact more than 500 GB LUNS or such. Will the LARGEST you can is not always the most efficient allocation of resources.

  Best regards

  Edward L. Haletky VMware communities user moderator, VMware vExpert 2009, url = http://www.virtualizationpractice.comvirtualization practical analyst [url]
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• Time range of statistical performance data store

  When I look at the performance of the data store tab in the performance monitor what time slot is used to generate the statistics?

  Hi Michael,

  The time slot is for 24 hours.

• Why is 'Use different data stores for disks of BONE and View Composer persistent' grayed out?

  I installed 5 (cluster host 2) vsphere, vcenter 5 discover 5 and openfiler (iSCSI VSA) in vmware workstation 7.

  I am trying to simulate a tiered storage configuration and created three warehouses of shared data in order to separate the replica, the linked clones and persistent disk.

  However, when I create my bound clone pool I am able to select a specific data store for the replica and bound but clone the persistent disk option is grayed out.  See photos attached to the pool creation, storage, and network configuration.

  Has anyone any suggestions?

  Thank you!

  Yes, the use of the disc for operating system profiles require a linked clone pool.     The operating system will be on the clone, persistent disk will be a disc loaded end service that survive refreshes and redials, and then the replica will be reading only one copy of the master image.    The replica in general has in the IO and is almost always placed on the SSD or storage faster than you have and the persistent data disk is usually low IO.

• How to create the data store with multiple LUNS

  Someone could please tell me that how can I have multiple LUNS in a single data store, is it possible?

  See the "Storage management" section in the document provided in the previous comment. You are probably looking for information on page 104.

• Move a data store virtual computer in another data store

  I need to switch two VM of exisiting data store to a new store of data within a cluster.  What is the best way to do it? I have to stop the virtual computer in order to move the data store? Thank you

  ESX 3.02

  When you right-click on the customer, choose migrate.  The third screen will give you two options, one is to keep the other move, click on move, then next and finish.

  I think the "passage to the option" are you referring about doing the same thing... I am testing now.  But I know with certainty, that the cold migration will work.

• There is no more space for virtual disk by turning on POS device.

  

  NOTE: After 2 days to schedule a daily backup of a critical server, WTP device is off and throw the foregoing pushed error while it turn. I understood that VDP device disk space is less than the amount of data backup pd. kindly suggest me how to overcome this problem.

  (physical host 3 + 1 environment SAN, VDP is located on one of the host's local storage physical there not on the SAN)

  looking for your kind suggestions/solutions.

  Kind regards

  Alaka

  ... VDP is located on one of the host's local storage physical there not on the SAN

  According to the error message, local storage of the physical host has run out of disk space due to unit VDP growing (thin provisioned) data disc "Data Protection 6.0_1.vmdk". Backups require more than currently available disk space, so there is not a lot of options available. You must either increase the data store to which this virtual disk is stored, or migrate to another, more department store of data if you want to continue to run backup jobs as they are currently configured.

  André

• Performance data store local vs fiber SAN disk IO

  I'm looking for a table of comparison of performance or other documents that will give me the change in the performance of the disk i/o for virtual machines that are hosted on local data warehouses vs fiber attached LUN.

  Does anyone know where I might be able to find this information?

  (HA, DRS and VMotion are not at stake here).

  Thank you.

  You won't find that.  There is NO way to give a comparison that you are comparing apples and screwdrivers, they are not the same family.

  SAN's storage shared, managed by a central unit full time on a fiber infrastructure.  But it depends on your switches fiber, HBA, your configuration, the disks in the SAN, the manufacturer of SAN, speed of the disks, the number of disks... It goes on and on.

  Each SAN / fiber / Configuration is very different.

  Local storage depends on the RAID configuration, manufacturer, your RAID card, disks... once again more info that can be included.  The line at the bottom is Local disk can be more responsive at times, but since you are limited to the number of disk (6 or 8) are limited to the performance, but the flow is the key.

  You will get a FLOW much more fiber than the local disk.  More load, less stress (since he is not relying on the local system to provide the resources AND the host operating system).

  SAS is better than SATA for the case of all VM on both systems.  so keep that in mind.  It is also very important to comparative analysis.  IOmeter will help you determine what is best for you.

• Swapping hard drives for change/increase the size of the data store

  Hello:

  I have an ESXi host 4.1 with 2x146GB RAID1 array (datastore1), 4x300GB RAID5 array (datastore2).  I need more space so I intend to replace 2x146GB by 2x2TB.  I'll first move virtual machines from datastore1 to datastore2, then stop the machine, Exchange records and build the new table.

  • What I need to remove ESXi cfg datastore1. before you physically remove the drives, or will start ESXi gracefully and allow me to remove the data store?
  • I'll be able to add the new data store (2x2TB) to ESXi, ago, i.e. ESXi should see table once initialized on the machine?
  • Existing data warehouses have 1 MB block size max vmdk is 256GB.  I want the new data store to have the block size of 8MB so I can have more VMDK.  I think I can fix the block size of data store when it was created, are, i.e. the ESXi installation can have warehouses of data with different block sizes, are?

  
  

  Thanks a lot for the ideas you have!

  
  

  Bob

  1.) why not just delete the GUI data store before you remove the discs?

  2.) If your controller has the disks properly there should be no problem with their detection.

  3.) Yes, each data store may have a different block size. The block size can be selected when creating the data store on disk/LUN.

  André

• < unspecified file name > is greater than the taken maximum size supported by the data store ' < indeterminate datastore >

  Hello

  I made a mistake.

  Block size was set at 2 MB, vmdisk 500 GB value has tried to bring to 600, do you have a message that it was not possible. VMDK was set to 512 GB after that operation is completed. The server is Windows 2003. the 11 additional GB, which is not allowed is visible to the guest OS. But I have not developed the partion with diskpart.

  The problem is that this snapshot of the operation failed. This is an easy way to decrease the vmdk to the original size of 500 GB (if possible without turning off). Without destroying the files.

  Thank you very much

  Solution 1 works if you have a second data store with the appropriate block size (4 or 8 MB)

  Solution 2 - as you said - requires additional disk space and stop times

  A possible solution (3) would be an upgrade to vSphere 5 allowing - after the upgrade of VMFS-5 data store - virtual disks with up to 2 TB less 512octets regardless of the size of block that exists. However, you must ensure vcenter Server as well as guests, access to the database are upgraded before the upgrade of VMFS data store. Also make sure that any 3rd party applications (eg backup) you use, support vSphere 5.

  Since you mention a LUN to Solution 2, I assume you are using a shared storage. You do not have the opportunity to present a different LUN for guests, that you could get in shape with the block of adequate size and then cold migrate the virtual machine to it?

  André

• How to make instant consolidation if the data store is out of disk space...

  Hello

  I have a virtual machine that has left many of the snapshot files and now can consolidate using the tool (he always said of disk space to make the consolidation)

  The data store have now 60 GB of free space when the space data store maximum disk is 850 GB and the busy VVMM over almost 700 GB of disk space...

  Can I attach a 3 TB USB drive to the ESXi server and move all the files through or another way to do...

  HELP ~ ~

  With the disk space required on drive E, it may be useful to consider an alternative:

  • create a (much smaller) another virtual disk
  • Stop all of the services entering drive E
  • Copy the data from drive E more to the new virtual disk (for example using robocopy)
  • switch drive letters
  • Once everything is working as expected, get rid of the old virtual disk

  This will not only reduce the disk space used on the data store, but also to ensure that the virtual disk cannot grow more.

  André

• Adding a measure to a 2nd store of data of the same lun.

  I'm trying to add a point to a data store. The LUN I want to use does not appear in the list.

  I installed new hard drives local to the host and have a 300 GB lun. I was able to extend one of the two data stores that I have installed, but it doesn't seem that the same lun is available in the other data store. Was there something I missed by configuring the new readers/lun? I need to be able to use this lun to multiple data stores and I thought it was possible.  I'm under ESX 4.0.

  Thank you!

  I understand that correctly. You try to use a part of this new drive to expand a data store and the other part for the second, for example to create two VMFS partitions on this disk? I don't think it will work, nor is it supported. 1 only store data on disk 1/LUN is supported.

  What can work is - if you don't have a RAID set - for splitting a RAID in logical volumes that are presented to host ESXi and separate records.

  André